Differential influence of elevated CO2 on gas exchange and water use efficiency of four indigenous shrub species distributed in different sandy environments in central Inner Mongolia
- 17 Downloads
In view of the increase in global warming and carbon dioxide (CO2) concentrations, it is essential to investigate the influences of climate change on plant growth and water use in arid and semi-arid grassland species. Experiments were conducted to understand the ecophysiological response of four indigenous species to elevated CO2 in the semi-arid sandy grassland of central Inner Mongolia. Seedlings of the four species were grown for 8 weeks at four different consistently elevated CO2 concentrations in the environment-controlled growth chambers. All four elevated CO2 concentrations (400, 800, 1200, 1600 ppm) were found to result in decreased stomatal conductance (26–86%), decreased transpiration rate (21–80%), increased shoot water potential (1–42%) and increased water use efficiency (WUE) (10–412%) for two Artemisia species and Caragana korshinskii. Under our experimental conditions, the two Artemisia species and C. korshinskii would benefit more than Hedysarum laeve from exposure to elevated CO2 in terms of higher shoot water potential and WUE combined with lower stomatal conductance and transpiration rate. The results indicate that in a warmer, CO2-enriched future atmospheric environment, WUE in semi-arid grasslands may be higher than previously expected. Our findings will provide information for screening appropriate species for restoration of the degraded sandy grasslands in semi-arid areas under future climate change scenarios.
KeywordsElevated CO2 Artemisia sphaerocephala Artemisia ordosica Hedysarum laeve Caragana korshinskii
This work was supported by the National Natural Science Foundation of China (Grant Numbers 41330749 and 41401105).
- Bell JE, Weng E, Luo Y (2015) Ecohydrological responses to multifactor global change in a tallgrass prairie: a modeling analysis. J Geophys Res Biogeosci 115:701–719Google Scholar
- Dregne HE (1991) Global status of desertification. Ann Arid Zone 30:179–185Google Scholar
- IPCC Working Group 2 (2014) Fifth assessment report. Climate change 2014: synthesis report summary for policymakersGoogle Scholar
- Oren R, Waring RH, Stafford SG, Barrett JW (1987) Twenty-four years of ponderosa pine growth in relation to canopy leaf area and understory competition. For Sci 33:538–547Google Scholar
- Patterson DT, Flint EP (1991) Impact of carbon dioxide, trace gases, and climate change on global agriculture. American Society of Agronomy, LondonGoogle Scholar
- Qi J (1998) Aerial sowing for sand control in China. Science Press, BeijingGoogle Scholar
- Zhang X (1994) Principles and optimal models for development of Maowusu Sandy grassland. Acta Phytoecol Sin 18:1–16Google Scholar